Improved surface mass balance closure in ocean hindcast simulations

Harrison, Matthew; Adcroft, Alistair; Hallberg, Robert; Sergienko, Olga

doi:10.1029/2021MS002888

i

Improved surface mass balance closure in ocean hindcast simulations

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2022
By Harrison, Matthew ; Adcroft, Alistair ; Hallberg, Robert ; ...

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Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

Harrison, Matthew ; Adcroft, Alistair ; Hallberg, Robert ; Sergienko, Olga
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; WPO (Weather Program Office) ; CIMES (Cooperative Institute for Modeling the Earth System)
Description:

Forced global ocean/sea-ice hindcast simulations are subject to persistent surface mass flux estimation biases, for example, configurations with an explicit-free surface may not take into account the seasonal storage of water on land when constraining sea level. We present a physically motivated surface mass flux closure, that results in: reduced watermass drift from initialization; improved Atlantic meridional overturning cirulation intensity; and more realistic rates of ocean heat uptake, in simulations using global ocean/sea-ice/land (MOM6/SIS2/LM3) model configurations, forced with atmospheric reanalysis data. In addition to accounting for the land storage, the area-integrated subpolar-to-polar (40°–90°N/S) surface mass fluxes are constrained, using a climatological estimate derived from the the CMIP6 historical ensemble, which helps to further improve hindcast performance. Simulations using MERRA-2 and JRA55-do forcing, subject to identical hydrologic constraints, exhibit similar reductions in drift.
Keywords:

Freshwater Hydrology Ocean Circulation Ocean Circulation
Source:

Journal of Advances in Modeling Earth Systems, 14, e2021MS002888
DOI:

https://doi.org/10.1029/2021MS002888
Document Type:

Journal Article
Funding:

Grant no. NA18OAR4320123
Compliance:

Submitted
Main Document Checksum:

urn:sha256:24e31b0a45ea802580ad0a929ce162a9e077b6e671b1a7c1f9bfad0cf40983e0
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https://repository.library.noaa.gov/view/noaa/46429/noaa_46429_DS1.pdf
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[PDF - 3.65 MB ]

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